voltage and memory question

[cronus1914]

Okay, I looked at my CPU and while it doesnt say its speed
it does say 2.8V. So, am I right in thinking that as long as
I can set my new motherboard to run at 2.8V I can use this
Intel Pentium MMX procesor I already have??
I bought my mb on ebay and it gave the following information:

Single ZIF socket 7 for Intel Pentium processor support for
90, 100, 133,150, 166 and 200MHz processors

Voltage Regulated Extension (VRE) and Voltage Regulated (VR) support (for use with MMX technology).
Voltage regulator available for $7.00

What is the second part of this description telling me???


Ok, another quick question. When would you buy PC100 memory?
If you have a 100 MHz FSB? What I mean is, what is the 100 in
PC100 refering to??

[mjc]

Not quite sure about the first part of your question, but the seond part, basically PC-100 memoory is rated to handle running at 100MHz FSB, but it can run at 66MHz just fine and may even do higher, if it is quality memory (some of the better brands can actually do 125MHz without errors)

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mjc
Links list:Computer Links (http://www.dreamwater.org/tech/mjc/index.htm)

Celts are the men that heaven made mad, For all their battles are merry and their songs are all sad.

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[Randy_tx]

I've been running PC-100 SDRAM @ 133 mhz for over 3 months solid as a rock.

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Will XP save Me ?

[psabi]

Your board is for CLASSIC pentiums, not the MMX pentiums. The voltage regulator they are selling is ideally so the board can support the the dual voltage necessity of pentium MMX chips as well as AMD K6-2 chips. This is where you get involved with core voltage as well as I/O voltage.

Although the board can support the 2.8 "core" voltage on your MMX processor, without the additional volt regulator, the I/O voltage will be 2.8 as well AND THAT NOT GOOD (the I/O voltage for a MMX is 3.3 which is the case for MOST of the socket 7 processors).

Without the $7 regulator, you will not have "positive results" or possibly a working processor. Do not use the MMX on that board without it!

If it means anything, the later classic pentiums 150mhz and up as well as the pentium MMX models are easily overclockable. With a quality heat sink and a decent cooling solution, you can move upward. But I digress, post a question about overclocking and we can go from there.

As for your memory question, MJC is right on. You may also see the memory referred to with the abbreviation "ns". PC-66 is equal to 15ns, Pc-100 is equal to 10ns and pc-133 is equal to 7.5ns (although some manufacturers will take liberty with rounding to 7ns...)

Usually the prices are identical for pc66 and pc100; I see it fairly common that pc100 and pc133 are the same price. Although the processors for the board you described will only require PC-66, it won't hurt anything to get pc-100. Might be a better idea as you may be able to recycle that pc-100 memory later for another system...

-P

[Paleo Pete]

psabi Please do not suggest overclocking. We don't want to have someone frying components because someone on this forum suggested overclocking, when they may or may not know anything about how to do it. If a person specifically asks, fine, but don't give them the idea...even when they do ask we usually try to discourage the idea, at least until we're positive the person KNOWS what he or she is getting into.

The ns and MHz ratings for memory are two different things. The MHz rating it the bus speed of the memory, or the speed at which it communicates with the computer. PC-100 runs at 100MHz, PC-133 at 133MHz etc. The ns is the access time. If the last number in the chip ID number is a 7 it's 70ns access time. That means it takes 70ns (nanoseconds?) to access and read that memory chip.

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